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Wed, 12 Oct 2022 11:15:35 -0400 From: =?utf-8?q?Nuno_S=C3=A1?= To: , , , , CC: Chen-Yu Tsai , Andriy Tryshnivskyy , Ciprian Regus , Vladimir Zapolskiy , Cixi Geng , Neil Armstrong , "Miquel Raynal" , Sascha Hauer , Heiko Stuebner , =?utf-8?q?Nuno_S=C3=A1?= , Fabio Estevam , Jerome Brunet , Martin Blumenstingl , Pengutronix Kernel Team , Baolin Wang , "Hans de Goede" , Alexandru Ardelean , Michael Hennerich , Haibo Chen , Lars-Peter Clausen , Jyoti Bhayana , Jonathan Cameron , Andy Shevchenko , Florian Boor , Chunyan Zhang , Orson Zhai , "Shawn Guo" , Kevin Hilman Subject: [PATCH v3 2/4] iio: health: max30100: do not use internal iio_dev lock Date: Wed, 12 Oct 2022 17:16:18 +0200 Message-ID: <20221012151620.1725215-3-nuno.sa@analog.com> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221012151620.1725215-1-nuno.sa@analog.com> References: <20221012151620.1725215-1-nuno.sa@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: nM1f-X8TjScKJQm23JxZD5qneviuxiXN X-Proofpoint-ORIG-GUID: nM1f-X8TjScKJQm23JxZD5qneviuxiXN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-12_07,2022-10-12_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 suspectscore=0 mlxscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 malwarescore=0 phishscore=0 mlxlogscore=940 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210120100 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221012_081606_601577_9E49A471 X-CRM114-Status: GOOD ( 15.86 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org The pattern used in this device does not quite fit in the iio_device_claim_direct_mode() typical usage. In this case, iio_buffer_enabled() was being used not to prevent the raw access but to allow it. Hence, let's make use of the new iio_device_claim_buffer_mode() API to make sure we stay in buffered mode during the complete read. Note that we are shadowing the error code returned by iio_device_claim_buffer_mode() so that we keep the original one (-EAGAIN). The reason is that some userspace stack might already be relying on this particular code so that we are not taking chances and leave it alone. Signed-off-by: Nuno Sá --- drivers/iio/health/max30100.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/iio/health/max30100.c b/drivers/iio/health/max30100.c index 2cca5e0519f8..6ac49901c9da 100644 --- a/drivers/iio/health/max30100.c +++ b/drivers/iio/health/max30100.c @@ -387,18 +387,15 @@ static int max30100_read_raw(struct iio_dev *indio_dev, * Temperature reading can only be acquired while engine * is running */ - mutex_lock(&indio_dev->mlock); - - if (!iio_buffer_enabled(indio_dev)) + if (iio_device_claim_buffer_mode(indio_dev)) { ret = -EAGAIN; - else { + } else { ret = max30100_get_temp(data, val); if (!ret) ret = IIO_VAL_INT; + iio_device_release_buffer_mode(indio_dev); } - - mutex_unlock(&indio_dev->mlock); break; case IIO_CHAN_INFO_SCALE: *val = 1; /* 0.0625 */