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mtd: rawnand: gpmi: fix reference count leak in gpmi ops

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[ Upstream commit 1b391c7f2e863985668d705f525af3ceb55bc800 ]

pm_runtime_get_sync() will increment pm usage at first and it
will resume the device later. If runtime of the device has
error or device is in inaccessible state(or other error state),
resume operation will fail. If we do not call put operation to
decrease the reference, it will result in reference leak in
the two functions(gpmi_init and gpmi_nfc_exec_op). Moreover,
this device cannot enter the idle state and always stay busy or
other non-idle state later. So we fixed it through adding
pm_runtime_put_noidle.

Fixes: 5bc6bb603b ("mtd: rawnand: gpmi: Fix suspend/resume problem")
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Acked-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20201107110552.1568742-1-zhangqilong3@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhang Qilong 2020-11-07 19:05:52 +08:00 committed by Greg Kroah-Hartman
parent 0440989a08
commit a50f5a6393
1 changed files with 6 additions and 2 deletions
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8
drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
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@ -149,8 +149,10 @@ static int gpmi_init(struct gpmi_nand_data *this)
int ret;
ret = pm_runtime_get_sync(this->dev);
if (ret < 0)
if (ret < 0) {
pm_runtime_put_noidle(this->dev);
return ret;
}
ret = gpmi_reset_block(r->gpmi_regs, false);
if (ret)
@ -2263,8 +2265,10 @@ static int gpmi_nfc_exec_op(struct nand_chip *chip,
this->transfers[i].direction = DMA_NONE;
ret = pm_runtime_get_sync(this->dev);
if (ret < 0)
if (ret < 0) {
pm_runtime_put_noidle(this->dev);
return ret;
}
/*
* This driver currently supports only one NAND chip. Plus, dies share