diff mbox series

[Concept,02/21] serial: Retry output if it fails

Message ID	20251214175449.3799539-3-sjg@u-boot.org
State	New
Headers	From: Simon Glass <sjg@u-boot.org> To: U-Boot Concept <concept@u-boot.org> Date: Sun, 14 Dec 2025 10:54:24 -0700 Message-ID: <20251214175449.3799539-3-sjg@u-boot.org> In-Reply-To: <20251214175449.3799539-1-sjg@u-boot.org> References: <20251214175449.3799539-1-sjg@u-boot.org> MIME-Version: 1.0 Message-ID-Hash: MGMP57TXKVCCJCBH4ZS2YMSSHSMRLYUT CC: Heinrich Schuchardt <xypron.glpk@gmx.de>, Simon Glass <simon.glass@canonical.com> Precedence: list Subject: [Concept] [PATCH 02/21] serial: Retry output if it fails Archived-At: <https://lists.u-boot.org/archives/list/concept@u-boot.org/message/MGMP57TXKVCCJCBH4ZS2YMSSHSMRLYUT/> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit
Series	test: Add support for passing arguments to C unit tests \| [Concept,00/21] test: Add support for passing arguments to C unit tests [Concept,01/21] configs: raise SPL_SYS_MALLOC_SIZE to 8 MiB on RISC-V [Concept,02/21] serial: Retry output if it fails [Concept,03/21] sandbox: serial: Report output failurs [Concept,04/21] doc: Expand printf documentation [Concept,05/21] doc: Document tiny printf for SPL [Concept,06/21] vsprintf: Add support for the %pV format-specifier [Concept,07/21] check_linker_lists: Enhance detection of alignment problems [Concept,08/21] linker_lists: Fix end-marker alignment to prevent padding [Concept,09/21] test: vbe: Fix the ut-flag order in vbe_test_fixup_norun() [Concept,10/21] test: Add a helper to check the next line against a regex [Concept,11/21] test: Add argument-type definitions [Concept,12/21] test: Add a macro to declare unit tests with arguments [Concept,13/21] test: Add support for passing arguments to C tests [Concept,14/21] test: Enhance the ut command to pass test arguments [Concept,15/21] test: Add type-checked argument accessor functions [Concept,16/21] test: Add a private buffer for tests [Concept,17/21] test: Allow preserving console recording on failure [Concept,18/21] test: Add tests for unit-test arguments [Concept,19/21] test: fs: add C-based filesystem tests [Concept,20/21] test: fs: Update Python tests to call C implementations [Concept,21/21] test: Add documentation for test parameters

Commit Message

Simon Glass Dec. 14, 2025, 5:54 p.m. UTC

  From: Simon Glass <simon.glass@canonical.com>

If something goes wrong when writing to the serial device, take notice
of the error code and try again, if needed.

Signed-off-by: Simon Glass <simon.glass@canonical.com>
---

 drivers/serial/serial-uclass.c | 2 ++
 1 file changed, 2 insertions(+)

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Patch

diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c
index 8644d210770..8d330d687a3 100644
--- a/drivers/serial/serial-uclass.c
+++ b/drivers/serial/serial-uclass.c
@@ -271,6 +271,8 @@  static int __serial_puts(struct udevice *dev, const char *str, size_t len)
 	do {
 		ssize_t written = ops->puts(dev, str, len);
 
+		if (written == -EAGAIN)
+			continue;
 		if (written < 0)
 			return written;
 		str += written;