[PATCH v4 0/2] mtd: spi-nor: core: Fix RWW wait locking

From: Runyu Xiao <runyu.xiao@seu.edu.cn>
To: Tudor Ambarus <tudor.ambarus@linaro.org>
Cc: Pratyush Yadav <pratyush@kernel.org>,
	Michael Walle <mwalle@kernel.org>,
	Takahiro Kuwano <takahiro.kuwano@infineon.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org, Runyu Xiao <runyu.xiao@seu.edu.cn>,
	Jianhao Xu <jianhao.xu@seu.edu.cn>
Subject: [PATCH v4 0/2] mtd: spi-nor: core: Fix RWW wait locking
Date: Wed, 19 Aug 2026 22:03:35 +0800	[thread overview]
Message-ID: <20260819140337.36775-1-runyu.xiao@seu.edu.cn> (raw)
In-Reply-To: <0a15f6e8-f1ca-4945-9bd5-2b64a2802a58@linaro.org>

The RWW wait helpers must not block while evaluating the wait
condition. In the current code, spi_nor_rww_start_exclusive() can leave
nor->lock held on a false return. Also, if a killable RWW wait is
interrupted after spi_nor_prep(), the controller setup must be undone.

Patch 1 switches the four RWW start helpers to conditional scoped mutex
guards so the wait condition never sleeps and the mutex is always
released before returning.
Patch 2 unprepares the controller on interrupted waits in the three
spi_nor_prep_and_lock() helpers.

Runyu Xiao (2):
  mtd: spi-nor: core: Fix mutex leak in spi_nor_rww_start_exclusive()
  mtd: spi-nor: core: Unprepare after interrupted RWW wait

 drivers/mtd/spi-nor/core.c | 93 ++++++++++++++++++++++----------------
 1 file changed, 54 insertions(+), 39 deletions(-)

base-commit: 2b533e775aec580cf60074417f4ca00ac9cf3580
-- 
2.34.1

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