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Thu, 05 Mar 2026 11:40:58 -0800 (PST) From: Sean Rhodes To: linux-mmc@vger.kernel.org, Ulf Hansson , Greg Kroah-Hartman Cc: Ricky Wu , Avri Altman , Binbin Zhou , Dan Carpenter , Jisheng Zhang , Nathan Chancellor , Arnd Bergmann , Huacai Chen , Ingo Molnar , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: [PATCH v2 5/6] rtsx_usb: hold runtime PM during transfers Date: Thu, 5 Mar 2026 19:40:51 +0000 Message-ID: <20260305194052.5120-6-sean@starlabs.systems> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260305194052.5120-1-sean@starlabs.systems> References: <1ca7b488a11e03b3f107f1829a40cf2c92c7d5fd.1771533586.git.sean@starlabs.systems> <20260305194052.5120-1-sean@starlabs.systems> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Hold a runtime-PM reference across bulk transfers, and mark the device busy afterwards. When runtime PM is already in progress (e.g. from rtsx_usb_suspend()), avoid forcing a runtime resume from within the PM path by using usb_autopm_get_interface_no_resume() unless the interface is already runtime-suspended. Signed-off-by: Sean Rhodes --- drivers/misc/cardreader/rtsx_usb.c | 38 ++++++++++++++++++++++++------ 1 file changed, 31 insertions(+), 7 deletions(-) diff --git a/drivers/misc/cardreader/rtsx_usb.c b/drivers/misc/cardreader/r= tsx_usb.c index 1830e9ed2521..5d818b632788 100644 --- a/drivers/misc/cardreader/rtsx_usb.c +++ b/drivers/misc/cardreader/rtsx_usb.c @@ -12,6 +12,7 @@ #include #include #include +#include #include =20 static int polling_pipe =3D 1; @@ -65,19 +66,42 @@ static int rtsx_usb_bulk_transfer_sglist(struct rtsx_uc= r *ucr, } =20 int rtsx_usb_transfer_data(struct rtsx_ucr *ucr, unsigned int pipe, - void *buf, unsigned int len, int num_sg, - unsigned int *act_len, int timeout) + void *buf, unsigned int len, int num_sg, + unsigned int *act_len, int timeout) { + int ret; + struct device *dev =3D &ucr->pusb_intf->dev; + if (timeout < 600) timeout =3D 600; =20 + /* + * During runtime suspend/resume callbacks, avoid forcing a runtime resume + * from within the PM path. The device is still active when + * rtsx_usb_suspend() runs, but usb_autopm_get_interface() can block when + * runtime PM is already in progress. + */ + if (pm_runtime_status_suspended(dev)) { + ret =3D usb_autopm_get_interface(ucr->pusb_intf); + } else { + usb_autopm_get_interface_no_resume(ucr->pusb_intf); + ret =3D 0; + } + if (ret) + return ret; + if (num_sg) - return rtsx_usb_bulk_transfer_sglist(ucr, pipe, - (struct scatterlist *)buf, num_sg, len, act_len, - timeout); + ret =3D rtsx_usb_bulk_transfer_sglist(ucr, pipe, + (struct scatterlist *)buf, + num_sg, len, act_len, + timeout); else - return usb_bulk_msg(ucr->pusb_dev, pipe, buf, len, act_len, - timeout); + ret =3D usb_bulk_msg(ucr->pusb_dev, pipe, buf, len, act_len, + timeout); + + usb_mark_last_busy(ucr->pusb_dev); + usb_autopm_put_interface(ucr->pusb_intf); + return ret; } EXPORT_SYMBOL_GPL(rtsx_usb_transfer_data); =20 --=20 2.51.0