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SUNRPC: use _bh spinlocking on ->transport_lock

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Prior to Linux 5.3, ->transport_lock in sunrpc required the _bh style
spinlocks (when not called from a bottom-half handler).

When upstream 3848e96edf4788f772d83990022fa7023a233d83 was backported to
stable kernels, the spin_lock/unlock calls should have been changed to
the _bh version, but this wasn't noted in the patch and didn't happen.

So convert these lock/unlock calls to the _bh versions.

This patch is required for any stable kernel prior to 5.3 to which the
above mentioned patch was backported.  Namely 4.9.y, 4.14.y, 4.19.y.

Signed-off-by: NeilBrown <neilb@suse.de>
Reported-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Tested-by: Eugeniu Rosca <erosca@de.adit-jv.com>
This commit is contained in:
NeilBrown 2022-09-12 09:00:52 +10:00 committed by Greg Kroah-Hartman
parent a260a029d7
commit 026d558652
1 changed files with 2 additions and 2 deletions
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4
net/sunrpc/xprt.c
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@ -1451,9 +1451,9 @@ static void xprt_destroy(struct rpc_xprt *xprt)
* is cleared. We use ->transport_lock to ensure the mod_timer()
* can only run *before* del_time_sync(), never after.
*/
spin_lock(&xprt->transport_lock);
spin_lock_bh(&xprt->transport_lock);
del_timer_sync(&xprt->timer);
spin_unlock(&xprt->transport_lock);
spin_unlock_bh(&xprt->transport_lock);
rpc_xprt_debugfs_unregister(xprt);
rpc_destroy_wait_queue(&xprt->binding);