diff options
| author | Alexandre Bounine <alexandre.bounine@idt.com> | 2016-03-23 00:26:35 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-23 01:36:02 +0300 |
| commit | a7b4c636d83034f0e89d58651ef2e9b96564489a (patch) | |
| tree | 19e8ec4da76c040166f31a1d42265af5605dcb34 /drivers/rapidio/rio.c | |
| parent | b7dfca8bd446721cbc23f4a7cf3c407eb42175dc (diff) | |
| download | linux-a7b4c636d83034f0e89d58651ef2e9b96564489a.tar.xz | |
rapidio: add lock protection for doorbell list
Add lock protection around doorbell list handling to prevent list
corruption on SMP platforms.
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio/rio.c')
| -rw-r--r-- | drivers/rapidio/rio.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c index 03b8c5af72bb..e42f97e9e62a 100644 --- a/drivers/rapidio/rio.c +++ b/drivers/rapidio/rio.c @@ -362,7 +362,9 @@ rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res, dbell->dinb = dinb; dbell->dev_id = dev_id; + mutex_lock(&mport->lock); list_add_tail(&dbell->node, &mport->dbells); + mutex_unlock(&mport->lock); out: return rc; @@ -426,12 +428,15 @@ int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end) int rc = 0, found = 0; struct rio_dbell *dbell; + mutex_lock(&mport->lock); list_for_each_entry(dbell, &mport->dbells, node) { if ((dbell->res->start == start) && (dbell->res->end == end)) { + list_del(&dbell->node); found = 1; break; } } + mutex_unlock(&mport->lock); /* If we can't find an exact match, fail */ if (!found) { @@ -439,9 +444,6 @@ int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end) goto out; } - /* Delete from list */ - list_del(&dbell->node); - /* Release the doorbell resource */ rc = release_resource(dbell->res); @@ -2024,6 +2026,7 @@ int rio_mport_initialize(struct rio_mport *mport) mport->id = next_portid++; mport->host_deviceid = rio_get_hdid(mport->id); mport->nscan = NULL; + mutex_init(&mport->lock); return 0; } |