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Tue, 24 Jun 2025 11:16:17 -0700 (PDT) Received: from localhost ([2a02:8071:b783:6940:36f3:9aff:fec2:7e46]) by smtp.gmail.com with UTF8SMTPSA id a640c23a62f3a-ae053ecbda9sm905954066b.48.2025.06.24.11.16.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Jun 2025 11:16:16 -0700 (PDT) From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: linux-pwm@vger.kernel.org Cc: Claudiu Beznea , Nicolas Ferre , Alexandre Belloni , linux-arm-kernel@lists.infradead.org, Vladimir Zapolskiy , Conor Dooley , Daire McNamara , linux-riscv@lists.infradead.org, Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , linux-sunxi@lists.linux.dev Subject: [PATCH 0/8] pwm: Drop local locking in several drivers Date: Tue, 24 Jun 2025 20:15:36 +0200 Message-ID: X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1325; i=u.kleine-koenig@baylibre.com; h=from:subject:message-id; bh=S8bWVrtohU804TFCIPr4aot/z07tET4jFwVUKYqLlZ0=; b=owEBbQGS/pANAwAKAY+A+1h9Ev5OAcsmYgBoWutKdlfvI7KIzHJ+KN9OasXDBe9Ets/iGGJT3 I980PyuD9GJATMEAAEKAB0WIQQ/gaxpOnoeWYmt/tOPgPtYfRL+TgUCaFrrSgAKCRCPgPtYfRL+ ThL9B/wNCs36L/ISd4BA7zNBxQj5xBfjauGisVwporrJNf6qsKCwNrXQzidhknNvp946kr9gTj/ 3GZpj2d+UbQZ3AVgOMPIGsP4KkUomd8bCzxxuV8vCYvqB3oaXo4u7MUMI0/Y6JSmjh9RdLL2nz4 svG2I8ba2XHL8nWHRPNDbvQEPjsDTkU4/z536VcFjQXP1gSTOa/+Yh1JnyezwiP1gcGOBLeUj3P guQ2ykm0AKCku7biNbXTJzIkI1Mzz8P3Tso4jJGZ6a7mquAzUpmue2SbYP1gMV/nm416ULVDwW3 gxd2zphLoM96KFKamXLTbVyKW7sNAeHWRXFVNMiUH+EJF2Kx X-Developer-Key: i=u.kleine-koenig@baylibre.com; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 Status: O Hello, some time ago the pwm core implemented additional locking to protect lowlevel driver callbacks against driver removal. A side effect is that .apply() and .get_state() are serialized. This allows to drop some locking that is now superfluous due to the core's locking. I identified a few drivers that are affected; these are cleaned up accordingly here. Best regards Uwe Uwe Kleine-König (8): pwm: atmel: Drop driver local locking pwm: clps711x: Drop driver local locking pwm: fsl-ftm: Drop driver local locking pwm: lpc18xx-sct: Drop driver local locking pwm: microchip-core: Drop driver local locking pwm: sti: Drop driver local locking pwm: sun4i: Drop driver local locking pwm: twl-led: Drop driver local locking drivers/pwm/pwm-atmel.c | 12 -------- drivers/pwm/pwm-clps711x.c | 8 ------ drivers/pwm/pwm-fsl-ftm.c | 28 +++++------------- drivers/pwm/pwm-lpc18xx-sct.c | 14 --------- drivers/pwm/pwm-microchip-core.c | 17 +---------- drivers/pwm/pwm-sti.c | 23 ++++----------- drivers/pwm/pwm-sun4i.c | 10 ------- drivers/pwm/pwm-twl-led.c | 49 +++++--------------------------- 8 files changed, 21 insertions(+), 140 deletions(-) base-commit: f817b6dd2b62d921a6cdc0a3ac599cd1851f343c