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usb: dwc3-msm: Avoid access of gsi_reg for non-GSI targets

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Some targets do not have GSI feature. For such targets, gsi_reg
array does not get allocated. DWC3_CONTROLLER_NOTIFY_CLEAR_DB
event from gadget driver will access this unallocated memory.
Fix this by putting a check for gsi_reg.

Change-Id: I9903c0c6533abf3d6e689a40ea84ecbc066e10d8
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>
This commit is contained in:
Ajay Agarwal 2020-05-18 15:19:15 +05:30 • committed by Gerrit - the friendly Code Review server
commit 3737f15cc7
1 changed files with 8 additions and 6 deletions
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14
drivers/usb/dwc3/dwc3-msm.c
View file

@ -2482,12 +2482,14 @@ static void dwc3_msm_notify_event(struct dwc3 *dwc,
break;
case DWC3_CONTROLLER_NOTIFY_CLEAR_DB:
dev_dbg(mdwc->dev, "DWC3_CONTROLLER_NOTIFY_CLEAR_DB\n");
dwc3_msm_write_reg_field(mdwc->base,
GSI_GENERAL_CFG_REG(mdwc->gsi_reg),
BLOCK_GSI_WR_GO_MASK, true);
dwc3_msm_write_reg_field(mdwc->base,
GSI_GENERAL_CFG_REG(mdwc->gsi_reg),
GSI_EN_MASK, 0);
if (mdwc->gsi_reg) {
dwc3_msm_write_reg_field(mdwc->base,
GSI_GENERAL_CFG_REG(mdwc->gsi_reg),
BLOCK_GSI_WR_GO_MASK, true);
dwc3_msm_write_reg_field(mdwc->base,
GSI_GENERAL_CFG_REG(mdwc->gsi_reg),
GSI_EN_MASK, 0);
}
break;
default:
dev_dbg(mdwc->dev, "unknown dwc3 event\n");