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authorUrsula Braun <ubraun@linux.ibm.com>2018-11-12 17:06:12 +0100
committerDavid S. Miller <davem@davemloft.net>2018-11-14 14:21:20 -0800
commit007b656851ed7f94ba0fa358ac3e5d7705da6846 (patch)
treef62077055b50eff45d49a88443c69a6e6c0c3a99 /drivers/s390
parentdb8ddde766adf09605b5282e7978fa0ba76c3ee3 (diff)
downloadlinux-007b656851ed7f94ba0fa358ac3e5d7705da6846.tar.bz2
s390/ism: clear dmbe_mask bit before SMC IRQ handling
SMC-D stress workload showed connection stalls. Since the firmware decides to skip raising an interrupt if the SBA DMBE mask bit is still set, this SBA DMBE mask bit should be cleared before the IRQ handling in the SMC code runs. Otherwise there are small windows possible with missing interrupts for incoming data. SMC-D currently does not care about the old value of the SBA DMBE mask. Acked-by: Sebastian Ott <sebott@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/net/ism_drv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index f96ec68af2e5..dcbf5c857743 100644
--- a/drivers/s390/net/ism_drv.c
+++ b/drivers/s390/net/ism_drv.c
@@ -415,9 +415,9 @@ static irqreturn_t ism_handle_irq(int irq, void *data)
break;
clear_bit_inv(bit, bv);
+ ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
barrier();
smcd_handle_irq(ism->smcd, bit + ISM_DMB_BIT_OFFSET);
- ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
}
if (ism->sba->e) {