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Wysocki" To: Jiri Kosina , Bastien Nocera Cc: Filipe =?ISO-8859-1?Q?La=EDns?= , Benjamin Tissoires , linux-input@vger.kernel.org, LKML , "Rafael J. Wysocki" , Thorsten Leemhuis Subject: [PATCH v1 1/2] HID: generic: Add ->match() check to __check_hid_generic() Date: Wed, 07 Dec 2022 10:11:50 +0100 Message-ID: <4809717.31r3eYUQgx@kreacher> In-Reply-To: <5647715.DvuYhMxLoT@kreacher> References: <2262737.ElGaqSPkdT@kreacher> <5647715.DvuYhMxLoT@kreacher> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="UTF-8" X-CLIENT-IP: 213.134.169.108 X-CLIENT-HOSTNAME: 213.134.169.108 X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvhedrudekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppedvudefrddufeegrdduieelrddutdeknecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepvddufedrudefgedrudeiledruddtkedphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqedpnhgspghrtghpthhtohepkedprhgtphhtthhopehjihhkohhssehkvghrnhgvlhdrohhrghdprhgtphhtthhopehhrgguvghssheshhgruggvshhsrdhnvghtpdhrtghpthhtoheplhgrihhnshesrhhishgvuhhprdhnvghtpdhrtghpthhtohepsggvnhhjrghmihhnrdhtihhsshhoihhrvghssehrvgguhhgrthdrtghomhdprhgtphhtthhopehlihhnuhigqdhinhhpuhhtsehvghgvrhdrkhgvrhhn vghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtoheprhgrfhgrvghlsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehrvghgrhgvshhsihhonhhssehlvggvmhhhuhhishdrihhnfhho X-DCC--Metrics: v370.home.net.pl 1024; Body=8 Fuz1=8 Fuz2=8 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafael J. Wysocki Some special HID drivers (for example, hid-logitech-hidpp) use ->match() callbacks to reject specific devices that otherwise would match the driver's device ID list, with the expectation that those devices will be handled by some other drivers. However, this doesn't work if hid-generic is expected to bind to the given device, because its ->match() callback, hid_generic_match(), rejects all devices that match device ID lists of the other HID drivers regardless of what is returned by the other drivers' ->match() callbacks. To make it work, amend the function used by hid_generic_match() for checking an individual driver, __check_hid_generic(), with a check involving the given driver's ->match() callback, so 0 is returned when that callback rejects the device in question. Fixes: 532223c8ac57 ("HID: logitech-hidpp: Enable HID++ for all the Logitech Bluetooth devices") Signed-off-by: Rafael J. Wysocki --- drivers/hid/hid-generic.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) Index: linux-pm/drivers/hid/hid-generic.c =================================================================== --- linux-pm.orig/drivers/hid/hid-generic.c +++ linux-pm/drivers/hid/hid-generic.c @@ -31,7 +31,13 @@ static int __check_hid_generic(struct de if (hdrv == &hid_generic) return 0; - return hid_match_device(hdev, hdrv) != NULL; + if (!hid_match_device(hdev, hdrv)) + return 0; + + if (hdrv->match) + return hdrv->match(hdev, false); + + return 1; } static bool hid_generic_match(struct hid_device *hdev,