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authorVenkat Gopalakrishnan <venkatg@codeaurora.org>2018-05-03 13:07:20 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2018-05-18 18:22:47 +0200
commit7f6ba4f12e6cbfdefbb95cfd8fc67ece6c15d799 (patch)
tree6222a0ae4fb272f93dff985731ef7a36b9602bfc /drivers/scsi/ufs
parentscsi: ufs: ufs-qcom: remove broken hci version quirk (diff)
downloadlinux-7f6ba4f12e6cbfdefbb95cfd8fc67ece6c15d799.tar.xz
linux-7f6ba4f12e6cbfdefbb95cfd8fc67ece6c15d799.zip
scsi: ufs: make sure all interrupts are processed
As multiple requests are submitted to the ufs host controller in parallel there could be instances where the command completion interrupt arrives later for a request that is already processed earlier as the corresponding doorbell was cleared when handling the previous interrupt. Read the interrupt status in a loop after processing the received interrupt to catch such interrupts and handle it. Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org> Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs')
-rw-r--r--drivers/scsi/ufs/ufshcd.c27
1 files changed, 19 insertions, 8 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 2859f6395eea..028492179101 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5489,19 +5489,30 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba)
u32 intr_status, enabled_intr_status;
irqreturn_t retval = IRQ_NONE;
struct ufs_hba *hba = __hba;
+ int retries = hba->nutrs;
spin_lock(hba->host->host_lock);
intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
- enabled_intr_status =
- intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
- if (intr_status)
- ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
+ /*
+ * There could be max of hba->nutrs reqs in flight and in worst case
+ * if the reqs get finished 1 by 1 after the interrupt status is
+ * read, make sure we handle them by checking the interrupt status
+ * again in a loop until we process all of the reqs before returning.
+ */
+ do {
+ enabled_intr_status =
+ intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
+ if (intr_status)
+ ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
+ if (enabled_intr_status) {
+ ufshcd_sl_intr(hba, enabled_intr_status);
+ retval = IRQ_HANDLED;
+ }
+
+ intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
+ } while (intr_status && --retries);
- if (enabled_intr_status) {
- ufshcd_sl_intr(hba, enabled_intr_status);
- retval = IRQ_HANDLED;
- }
spin_unlock(hba->host->host_lock);
return retval;
}