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Sun, 09 Mar 2025 09:43:39 -0700 (PDT) From: Qasim Ijaz To: miquel.raynal@bootlin.com, Frank.Li@nxp.com, alexandre.belloni@bootlin.com Cc: linux-i3c@lists.infradead.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH] i3c: master: svc: fix signed/unsigned mismatch in dynamic address assignment Date: Sun, 9 Mar 2025 16:43:14 +0000 Message-Id: <20250309164314.15039-1-qasdev00@gmail.com> X-Mailer: git-send-email 2.39.5 Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 svc_i3c_master_do_daa_locked() declares dyn_addr as an unsigned int however it initialises it with i3c_master_get_free_addr() which returns a signed int type and then attempts to check if dyn_addr is less than 0. Unsigned integers cannot be less than 0, so the check is essentially redundant. Furthermore i3c_master_get_free_addr() could return -ENOMEM which an unsigned int cannot store. Fix this by capturing the return value of i3c_master_get_free_addr() in a signed int ‘dyn_addr_ret’. If that value is negative, return an error. Otherwise, assign it to the unsigned int ‘dyn_addr’ once we know it’s valid. Fixes: 4008a74e0f9b ("i3c: master: svc: Fix npcm845 FIFO empty issue") Signed-off-by: Qasim Ijaz --- drivers/i3c/master/svc-i3c-master.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index f22fb9e75142..eea08f00d7ce 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -998,9 +998,11 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master, * filling within a few hundred nanoseconds, which is significantly * faster compared to the 64 SCL clock cycles. */ - dyn_addr = i3c_master_get_free_addr(&master->base, last_addr + 1); - if (dyn_addr < 0) + int dyn_addr_ret = i3c_master_get_free_addr(&master->base, last_addr + 1); + + if (dyn_addr_ret < 0) return -ENOSPC; + dyn_addr = dyn_addr_ret; writel(dyn_addr, master->regs + SVC_I3C_MWDATAB);