From 304a2efe9d55875c6805f3c2957bc39ceebbc5c0 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Fri, 20 Oct 2023 09:55:35 +0200 Subject: crypto: caam/jr - Convert to platform remove callback returning void MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is (mostly) ignored and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new() which already returns void. The driver adapted here suffers from this wrong assumption. Returning -EBUSY if there are still users results in resource leaks and probably a crash. Also further down passing the error code of caam_jr_shutdown() to the caller only results in another error message and has no further consequences compared to returning zero. Still convert the driver to return no value in the remove callback. This also allows to drop caam_jr_platform_shutdown() as the only function called by it now has the same prototype. Signed-off-by: Uwe Kleine-König Signed-off-by: Herbert Xu --- drivers/crypto/caam/jr.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) (limited to 'drivers/crypto') diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c index b1f1b393b98e..26eba7de3fb0 100644 --- a/drivers/crypto/caam/jr.c +++ b/drivers/crypto/caam/jr.c @@ -180,7 +180,7 @@ static int caam_jr_shutdown(struct device *dev) return ret; } -static int caam_jr_remove(struct platform_device *pdev) +static void caam_jr_remove(struct platform_device *pdev) { int ret; struct device *jrdev; @@ -193,11 +193,14 @@ static int caam_jr_remove(struct platform_device *pdev) caam_rng_exit(jrdev->parent); /* - * Return EBUSY if job ring already allocated. + * If a job ring is still allocated there is trouble ahead. Once + * caam_jr_remove() returned, jrpriv will be freed and the registers + * will get unmapped. So any user of such a job ring will probably + * crash. */ if (atomic_read(&jrpriv->tfm_count)) { - dev_err(jrdev, "Device is busy\n"); - return -EBUSY; + dev_alert(jrdev, "Device is busy; consumers might start to crash\n"); + return; } /* Unregister JR-based RNG & crypto algorithms */ @@ -212,13 +215,6 @@ static int caam_jr_remove(struct platform_device *pdev) ret = caam_jr_shutdown(jrdev); if (ret) dev_err(jrdev, "Failed to shut down job ring\n"); - - return ret; -} - -static void caam_jr_platform_shutdown(struct platform_device *pdev) -{ - caam_jr_remove(pdev); } /* Main per-ring interrupt handler */ @@ -823,8 +819,8 @@ static struct platform_driver caam_jr_driver = { .pm = pm_ptr(&caam_jr_pm_ops), }, .probe = caam_jr_probe, - .remove = caam_jr_remove, - .shutdown = caam_jr_platform_shutdown, + .remove_new = caam_jr_remove, + .shutdown = caam_jr_remove, }; static int __init jr_driver_init(void) -- cgit v1.2.3