From 961ed94e8a83d8881546a278bf844699af92a502 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Mon, 3 Jun 2019 16:44:06 -0700 Subject: scsi: ibmvscsi: Don't use rc uninitialized in ibmvscsi_do_work clang warns: drivers/scsi/ibmvscsi/ibmvscsi.c:2126:7: warning: variable 'rc' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] case IBMVSCSI_HOST_ACTION_NONE: ^~~~~~~~~~~~~~~~~~~~~~~~~ drivers/scsi/ibmvscsi/ibmvscsi.c:2151:6: note: uninitialized use occurs here if (rc) { ^~ Initialize rc in the IBMVSCSI_HOST_ACTION_UNBLOCK case statement then shuffle IBMVSCSI_HOST_ACTION_NONE down to the default case statement and make it return early so that rc is never used uninitialized in this function. Fixes: 035a3c4046b5 ("scsi: ibmvscsi: redo driver work thread to use enum action states") Link: https://github.com/ClangBuiltLinux/linux/issues/502 Suggested-by: Michael Ellerman Suggested-by: Tyrel Datwyler Signed-off-by: Nathan Chancellor Acked-by: Tyrel Datwyler Signed-off-by: Martin K. Petersen --- drivers/scsi/ibmvscsi/ibmvscsi.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/scsi/ibmvscsi') diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index 727c31dc11a0..fcfaf037b5bf 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -2123,8 +2123,8 @@ static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) spin_lock_irqsave(hostdata->host->host_lock, flags); switch (hostdata->action) { - case IBMVSCSI_HOST_ACTION_NONE: case IBMVSCSI_HOST_ACTION_UNBLOCK: + rc = 0; break; case IBMVSCSI_HOST_ACTION_RESET: spin_unlock_irqrestore(hostdata->host->host_lock, flags); @@ -2142,8 +2142,10 @@ static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) if (!rc) rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); break; + case IBMVSCSI_HOST_ACTION_NONE: default: - break; + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + return; } hostdata->action = IBMVSCSI_HOST_ACTION_NONE; -- cgit v1.2.1