From: Christophe Kerello christophe.kerello@st.com
As "v" is a local variable in stm32_i2c_choose_solution() "v" has to be copied into "s" to avoid data abort in stm32_i2c_compute_timing().
Signed-off-by: Christophe Kerello christophe.kerello@st.com Reviewed-by: Patrick DELAUNAY patrick.delaunay@st.com Signed-off-by: Patrice Chotard patrice.chotard@st.com ---
v2: rebase on top of v2017.11-rc2
drivers/i2c/stm32f7_i2c.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/drivers/i2c/stm32f7_i2c.c b/drivers/i2c/stm32f7_i2c.c index 196f236..346748d 100644 --- a/drivers/i2c/stm32f7_i2c.c +++ b/drivers/i2c/stm32f7_i2c.c @@ -571,6 +571,7 @@ static int stm32_i2c_choose_solution(struct stm32_i2c_setup *setup, u32 dnf_delay; u32 tsync; u16 l, h; + bool sol_found = false; int ret = 0;
af_delay_min = setup->analog_filter ? @@ -619,14 +620,15 @@ static int stm32_i2c_choose_solution(struct stm32_i2c_setup *setup, clk_error_prev = clk_error; v->scll = l; v->sclh = h; - s = v; + sol_found = true; + memcpy(s, v, sizeof(*s)); } } } } }
- if (!s) { + if (!sol_found) { pr_err("%s: no solution at all\n", __func__); ret = -EPERM; } @@ -638,7 +640,7 @@ static int stm32_i2c_compute_timing(struct stm32_i2c_priv *i2c_priv, struct stm32_i2c_setup *setup, struct stm32_i2c_timings *output) { - struct stm32_i2c_timings *v, *_v, *s; + struct stm32_i2c_timings *v, *_v, s; struct list_head solutions; int ret;
@@ -669,21 +671,20 @@ static int stm32_i2c_compute_timing(struct stm32_i2c_priv *i2c_priv, return -EINVAL; }
- s = NULL; INIT_LIST_HEAD(&solutions); ret = stm32_i2c_compute_solutions(setup, &solutions); if (ret) goto exit;
- ret = stm32_i2c_choose_solution(setup, &solutions, s); + ret = stm32_i2c_choose_solution(setup, &solutions, &s); if (ret) goto exit;
- output->presc = s->presc; - output->scldel = s->scldel; - output->sdadel = s->sdadel; - output->scll = s->scll; - output->sclh = s->sclh; + output->presc = s.presc; + output->scldel = s.scldel; + output->sdadel = s.sdadel; + output->scll = s.scll; + output->sclh = s.sclh;
debug("%s: Presc: %i, scldel: %i, sdadel: %i, scll: %i, sclh: %i\n", __func__, output->presc,