linux-kernel - [PATCH 2/4] spi: spi-zynqmp-gqspi: add mutex locking for exec

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210408040223.23134-3-quanyang.wang@windriver.com>
Date:   Thu,  8 Apr 2021 12:02:21 +0800
From:   quanyang.wang@...driver.com
To:     Mark Brown <broonie@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Amit Kumar Mahapatra <amit.kumar-mahapatra@...inx.com>
Cc:     linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Quanyang Wang <quanyang.wang@...driver.com>
Subject: [PATCH 2/4] spi: spi-zynqmp-gqspi: add mutex locking for exec_op

From: Quanyang Wang <quanyang.wang@...driver.com>

The spi-mem framework has no locking to prevent ctlr->mem_ops->exec_op
from concurrency. So add the locking to zynqmp_qspi_exec_op.

Fixes: 1c26372e5aa9 ("spi: spi-zynqmp-gqspi: Update driver to use spi-mem framework")
Signed-off-by: Quanyang Wang <quanyang.wang@...driver.com>
Reviewed-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@...inx.com>
---
 drivers/spi/spi-zynqmp-gqspi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index d49ab6575553..3b39461d58b3 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -173,6 +173,7 @@ struct zynqmp_qspi {
 	u32 genfifoentry;
 	enum mode_type mode;
 	struct completion data_completion;
+	struct mutex op_lock;
 };
 
 /**
@@ -951,6 +952,7 @@ static int zynqmp_qspi_exec_op(struct spi_mem *mem,
 		op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
 		op->dummy.buswidth, op->data.buswidth);
 
+	mutex_lock(&xqspi->op_lock);
 	zynqmp_qspi_config_op(xqspi, mem->spi);
 	zynqmp_qspi_chipselect(mem->spi, false);
 	genfifoentry |= xqspi->genfifocs;
@@ -1084,6 +1086,7 @@ static int zynqmp_qspi_exec_op(struct spi_mem *mem,
 return_err:
 
 	zynqmp_qspi_chipselect(mem->spi, true);
+	mutex_unlock(&xqspi->op_lock);
 
 	return err;
 }
@@ -1156,6 +1159,8 @@ static int zynqmp_qspi_probe(struct platform_device *pdev)
 		goto clk_dis_pclk;
 	}
 
+	mutex_init(&xqspi->op_lock);
+
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
 	pm_runtime_set_active(&pdev->dev);
-- 
2.25.1