From a67b3719f32673a9890700c72b980acbd2749e49 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marek=20Beh=C3=BAn?= Date: Tue, 5 Oct 2021 15:56:01 +0200 Subject: mtd: spi-flash: Check for zero length in legacy spi_flash_*() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Check for zero length in the legacy spi_flash_read() / spi_flash_write() / spi_flash_erase() functions. On zero length, return 0 immediately, don't call the underlying method. Rationale: - these legacy functions call the _read(), _write() and _erase() methods of struct mtd - the DM callers of these methods already check for zero length - making all callers of these methods check for zero length makes it possible to remove the check from implementations of these _read(), _write() and _erase() methods Signed-off-by: Marek Behún --- include/spi_flash.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include/spi_flash.h') diff --git a/include/spi_flash.h b/include/spi_flash.h index 3d747c9..4d4ae89 100644 --- a/include/spi_flash.h +++ b/include/spi_flash.h @@ -165,6 +165,9 @@ static inline int spi_flash_read(struct spi_flash *flash, u32 offset, struct mtd_info *mtd = &flash->mtd; size_t retlen; + if (!len) + return 0; + return mtd->_read(mtd, offset, len, &retlen, buf); } @@ -174,6 +177,9 @@ static inline int spi_flash_write(struct spi_flash *flash, u32 offset, struct mtd_info *mtd = &flash->mtd; size_t retlen; + if (!len) + return 0; + return mtd->_write(mtd, offset, len, &retlen, buf); } @@ -188,6 +194,9 @@ static inline int spi_flash_erase(struct spi_flash *flash, u32 offset, return -EINVAL; } + if (!len) + return 0; + memset(&instr, 0, sizeof(instr)); instr.addr = offset; instr.len = len; -- cgit v1.1