From d8cedaabe71236d27da1ff03d32ab1da06ed041f Mon Sep 17 00:00:00 2001 From: Gavin Shan Date: Tue, 4 Oct 2016 11:25:47 +1100 Subject: [PATCH] net/ncsi: Avoid unused-value build warning from ia64-linux-gcc xchg() is used to set NCSI channel's state in order for consistent access to the state. xchg()'s return value should be used. Otherwise, one build warning will be raised (with -Wunused-value) as below message indicates. It is reported by ia64-linux-gcc (GCC) 4.9.0. net/ncsi/ncsi-manage.c: In function 'ncsi_channel_monitor': arch/ia64/include/uapi/asm/cmpxchg.h:56:2: warning: value computed is \ not used [-Wunused-value] ((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr)))) ^ net/ncsi/ncsi-manage.c:202:3: note: in expansion of macro 'xchg' xchg(&nc->state, NCSI_CHANNEL_INACTIVE); This removes the atomic access to NCSI channel's state avoid the above build warning. We have to hold the channel's lock when its state is readed or updated. No functional changes introduced. Signed-off-by: Gavin Shan Reviewed-by: Joel Stanley Signed-off-by: David S. Miller --- net/ncsi/ncsi-aen.c | 37 ++++++++++++++++------ net/ncsi/ncsi-manage.c | 71 ++++++++++++++++++++++++++++++++---------- 2 files changed, 81 insertions(+), 27 deletions(-) diff --git a/net/ncsi/ncsi-aen.c b/net/ncsi/ncsi-aen.c index d463468442ae..b41a6617d498 100644 --- a/net/ncsi/ncsi-aen.c +++ b/net/ncsi/ncsi-aen.c @@ -53,7 +53,9 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp, struct ncsi_aen_lsc_pkt *lsc; struct ncsi_channel *nc; struct ncsi_channel_mode *ncm; - unsigned long old_data; + bool chained; + int state; + unsigned long old_data, data; unsigned long flags; /* Find the NCSI channel */ @@ -62,20 +64,27 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp, return -ENODEV; /* Update the link status */ - ncm = &nc->modes[NCSI_MODE_LINK]; lsc = (struct ncsi_aen_lsc_pkt *)h; + + spin_lock_irqsave(&nc->lock, flags); + ncm = &nc->modes[NCSI_MODE_LINK]; old_data = ncm->data[2]; - ncm->data[2] = ntohl(lsc->status); + data = ntohl(lsc->status); + ncm->data[2] = data; ncm->data[4] = ntohl(lsc->oem_status); - if (!((old_data ^ ncm->data[2]) & 0x1) || - !list_empty(&nc->link)) + + chained = !list_empty(&nc->link); + state = nc->state; + spin_unlock_irqrestore(&nc->lock, flags); + + if (!((old_data ^ data) & 0x1) || chained) return 0; - if (!(nc->state == NCSI_CHANNEL_INACTIVE && (ncm->data[2] & 0x1)) && - !(nc->state == NCSI_CHANNEL_ACTIVE && !(ncm->data[2] & 0x1))) + if (!(state == NCSI_CHANNEL_INACTIVE && (data & 0x1)) && + !(state == NCSI_CHANNEL_ACTIVE && !(data & 0x1))) return 0; if (!(ndp->flags & NCSI_DEV_HWA) && - nc->state == NCSI_CHANNEL_ACTIVE) + state == NCSI_CHANNEL_ACTIVE) ndp->flags |= NCSI_DEV_RESHUFFLE; ncsi_stop_channel_monitor(nc); @@ -97,13 +106,21 @@ static int ncsi_aen_handler_cr(struct ncsi_dev_priv *ndp, if (!nc) return -ENODEV; + spin_lock_irqsave(&nc->lock, flags); if (!list_empty(&nc->link) || - nc->state != NCSI_CHANNEL_ACTIVE) + nc->state != NCSI_CHANNEL_ACTIVE) { + spin_unlock_irqrestore(&nc->lock, flags); return 0; + } + spin_unlock_irqrestore(&nc->lock, flags); ncsi_stop_channel_monitor(nc); + spin_lock_irqsave(&nc->lock, flags); + nc->state = NCSI_CHANNEL_INVISIBLE; + spin_unlock_irqrestore(&nc->lock, flags); + spin_lock_irqsave(&ndp->lock, flags); - xchg(&nc->state, NCSI_CHANNEL_INACTIVE); + nc->state = NCSI_CHANNEL_INACTIVE; list_add_tail_rcu(&nc->link, &ndp->channel_queue); spin_unlock_irqrestore(&ndp->lock, flags); diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c index ef017b871857..a26ce5132549 100644 --- a/net/ncsi/ncsi-manage.c +++ b/net/ncsi/ncsi-manage.c @@ -132,6 +132,7 @@ static void ncsi_report_link(struct ncsi_dev_priv *ndp, bool force_down) struct ncsi_dev *nd = &ndp->ndev; struct ncsi_package *np; struct ncsi_channel *nc; + unsigned long flags; nd->state = ncsi_dev_state_functional; if (force_down) { @@ -142,14 +143,21 @@ static void ncsi_report_link(struct ncsi_dev_priv *ndp, bool force_down) nd->link_up = 0; NCSI_FOR_EACH_PACKAGE(ndp, np) { NCSI_FOR_EACH_CHANNEL(np, nc) { + spin_lock_irqsave(&nc->lock, flags); + if (!list_empty(&nc->link) || - nc->state != NCSI_CHANNEL_ACTIVE) + nc->state != NCSI_CHANNEL_ACTIVE) { + spin_unlock_irqrestore(&nc->lock, flags); continue; + } if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) { + spin_unlock_irqrestore(&nc->lock, flags); nd->link_up = 1; goto report; } + + spin_unlock_irqrestore(&nc->lock, flags); } } @@ -163,20 +171,22 @@ static void ncsi_channel_monitor(unsigned long data) struct ncsi_package *np = nc->package; struct ncsi_dev_priv *ndp = np->ndp; struct ncsi_cmd_arg nca; - bool enabled; + bool enabled, chained; unsigned int timeout; unsigned long flags; - int ret; + int state, ret; spin_lock_irqsave(&nc->lock, flags); + state = nc->state; + chained = !list_empty(&nc->link); timeout = nc->timeout; enabled = nc->enabled; spin_unlock_irqrestore(&nc->lock, flags); - if (!enabled || !list_empty(&nc->link)) + if (!enabled || chained) return; - if (nc->state != NCSI_CHANNEL_INACTIVE && - nc->state != NCSI_CHANNEL_ACTIVE) + if (state != NCSI_CHANNEL_INACTIVE && + state != NCSI_CHANNEL_ACTIVE) return; if (!(timeout % 2)) { @@ -195,11 +205,15 @@ static void ncsi_channel_monitor(unsigned long data) if (timeout + 1 >= 3) { if (!(ndp->flags & NCSI_DEV_HWA) && - nc->state == NCSI_CHANNEL_ACTIVE) + state == NCSI_CHANNEL_ACTIVE) ncsi_report_link(ndp, true); + spin_lock_irqsave(&nc->lock, flags); + nc->state = NCSI_CHANNEL_INVISIBLE; + spin_unlock_irqrestore(&nc->lock, flags); + spin_lock_irqsave(&ndp->lock, flags); - xchg(&nc->state, NCSI_CHANNEL_INACTIVE); + nc->state = NCSI_CHANNEL_INACTIVE; list_add_tail_rcu(&nc->link, &ndp->channel_queue); spin_unlock_irqrestore(&ndp->lock, flags); ncsi_process_next_channel(ndp); @@ -508,6 +522,7 @@ static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp) struct ncsi_package *np = ndp->active_package; struct ncsi_channel *nc = ndp->active_channel; struct ncsi_cmd_arg nca; + unsigned long flags; int ret; nca.ndp = ndp; @@ -556,7 +571,9 @@ static void ncsi_suspend_channel(struct ncsi_dev_priv *ndp) break; case ncsi_dev_state_suspend_done: - xchg(&nc->state, NCSI_CHANNEL_INACTIVE); + spin_lock_irqsave(&nc->lock, flags); + nc->state = NCSI_CHANNEL_INACTIVE; + spin_unlock_irqrestore(&nc->lock, flags); ncsi_process_next_channel(ndp); break; @@ -574,6 +591,7 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp) struct ncsi_channel *nc = ndp->active_channel; struct ncsi_cmd_arg nca; unsigned char index; + unsigned long flags; int ret; nca.ndp = ndp; @@ -675,10 +693,12 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp) goto error; break; case ncsi_dev_state_config_done: + spin_lock_irqsave(&nc->lock, flags); if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) - xchg(&nc->state, NCSI_CHANNEL_ACTIVE); + nc->state = NCSI_CHANNEL_ACTIVE; else - xchg(&nc->state, NCSI_CHANNEL_INACTIVE); + nc->state = NCSI_CHANNEL_INACTIVE; + spin_unlock_irqrestore(&nc->lock, flags); ncsi_start_channel_monitor(nc); ncsi_process_next_channel(ndp); @@ -707,18 +727,25 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp) found = NULL; NCSI_FOR_EACH_PACKAGE(ndp, np) { NCSI_FOR_EACH_CHANNEL(np, nc) { + spin_lock_irqsave(&nc->lock, flags); + if (!list_empty(&nc->link) || - nc->state != NCSI_CHANNEL_INACTIVE) + nc->state != NCSI_CHANNEL_INACTIVE) { + spin_unlock_irqrestore(&nc->lock, flags); continue; + } if (!found) found = nc; ncm = &nc->modes[NCSI_MODE_LINK]; if (ncm->data[2] & 0x1) { + spin_unlock_irqrestore(&nc->lock, flags); found = nc; goto out; } + + spin_unlock_irqrestore(&nc->lock, flags); } } @@ -987,11 +1014,14 @@ int ncsi_process_next_channel(struct ncsi_dev_priv *ndp) goto out; } - old_state = xchg(&nc->state, NCSI_CHANNEL_INVISIBLE); list_del_init(&nc->link); - spin_unlock_irqrestore(&ndp->lock, flags); + spin_lock_irqsave(&nc->lock, flags); + old_state = nc->state; + nc->state = NCSI_CHANNEL_INVISIBLE; + spin_unlock_irqrestore(&nc->lock, flags); + ndp->active_channel = nc; ndp->active_package = nc->package; @@ -1006,7 +1036,7 @@ int ncsi_process_next_channel(struct ncsi_dev_priv *ndp) break; default: netdev_err(ndp->ndev.dev, "Invalid state 0x%x on %d:%d\n", - nc->state, nc->package->id, nc->id); + old_state, nc->package->id, nc->id); ncsi_report_link(ndp, false); return -EINVAL; } @@ -1151,6 +1181,8 @@ int ncsi_start_dev(struct ncsi_dev *nd) struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd); struct ncsi_package *np; struct ncsi_channel *nc; + unsigned long flags; + bool chained; int old_state, ret; if (nd->state != ncsi_dev_state_registered && @@ -1166,8 +1198,13 @@ int ncsi_start_dev(struct ncsi_dev *nd) /* Reset channel's state and start over */ NCSI_FOR_EACH_PACKAGE(ndp, np) { NCSI_FOR_EACH_CHANNEL(np, nc) { - old_state = xchg(&nc->state, NCSI_CHANNEL_INACTIVE); - WARN_ON_ONCE(!list_empty(&nc->link) || + spin_lock_irqsave(&nc->lock, flags); + chained = !list_empty(&nc->link); + old_state = nc->state; + nc->state = NCSI_CHANNEL_INACTIVE; + spin_unlock_irqrestore(&nc->lock, flags); + + WARN_ON_ONCE(chained || old_state == NCSI_CHANNEL_INVISIBLE); } } -- 2.20.1