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rapidio: add lock protection for doorbell list

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Add lock protection around doorbell list handling to prevent list
corruption on SMP platforms.

Signed-off-by: Alexandre Bounine <[email protected]>
Cc: Matt Porter <[email protected]>
Cc: Aurelien Jacquiot <[email protected]>
Cc: Andre van Herk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alexandre Bounine 2016-03-22 14:26:35 -07:00 • committed by Linus Torvalds
commit a7b4c636d8
2 changed files with 8 additions and 3 deletions
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9
drivers/rapidio/rio.c
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@ -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;
}