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msm: ipa3: Use read memory barrier before reading events

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Use read memory barrier before reading event from event ring.
Since ring is shared resource between IPA h/w and IPA driver
dma_rmb is used to ensure memory write is complete before
reading from driver.

Change-Id: If2b86ee1acecbdfc75beb327eb60f876e6915d8f
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>
This commit is contained in:
Ashok Vuyyuru 2021-03-11 21:09:01 +05:30
commit 741d97715b
1 changed files with 1 additions and 2 deletions
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3
drivers/platform/msm/gsi/gsi.c
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@ -598,8 +598,7 @@ static void gsi_process_evt_re(struct gsi_evt_ctx *ctx,
/* RMB before reading event ring shared b/w IPA h/w & driver
* ordering between IPA h/w store and CPU load
*/
if (callback)
dma_rmb();
dma_rmb();
evt = (struct gsi_xfer_compl_evt *)(ctx->ring.base_va +
ctx->ring.rp_local - ctx->ring.base);
gsi_process_chan(evt, notify, callback);